Was the issue you were experiencing saying D3D lost? If not, you could try to uninstall and reinstall the engine. If it has to do with the launcher just redownload that too. 
If your issue persists, let me know!
Was the issue you were experiencing saying D3D lost? If not, you could try to uninstall and reinstall the engine. If it has to do with the launcher just redownload that too.
If your issue persists, let me know!